Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1226
CALL
Alliant Energy
LNT
$19.4B
| $2.36M | 0.01% |
500
+488
| +4,067% | +$21.9K |
|
1227
PUT
LendingTree
TREE
$544M
| $2.35M | 0.01% |
67
-143
| -68% | -$43.2K |
|
1228
PUT
Itaú Unibanco
ITUB
$91.3B
| $2.35M | 0.01% |
3,319
-2,177
| -40% | -$15.4K |
|
1229
CALL
Thor Industries
THO
$3.99B
| $2.35M | 0.01% |
377
+268
| +246% | +$17K |
|
1230
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $2.35M | 0.01% |
674
+133
| +25% | +$1.18K |
|
1231
PUT
Cracker Barrel
CBRL
$1.2B
| $2.34M | 0.01% |
145
+98
| +209% | +$16.1K |
|
1232
CALL
Equity Lifestyle Properties
ELS
$12.8B
| $2.34M | 0.01% |
+410
| New | +$21.9K |
|
1233
PUT
Owens Corning
OC
$11.5B
| $2.34M | 0.01% |
497
+380
| +325% | +$18.6K |
|
1234
CALL
UBS Group
UBS
$170B
| $2.34M | 0.01% |
1,933
+351
| +22% | +$4.45K |
|
1235
CALL
SEI Investments
SEIC
$11.9B
| $2.33M | 0.01% |
447
+416
| +1,342% | +$20.8K |
|
|
KYNB
1236
CALL
Kyntra Bio
KYNB
$28.5M
| $2.33M | 0.01% |
17
| – | – |
|
1237
CALL
Shake Shack
SHAK
$2.3B
| $2.33M | 0.01% |
394
+114
| +41% | +$5.84K |
|
1238
PUT
KKR & Co
KKR
$89.2B
| $2.33M | 0.01% |
990
-5
| -0.5% | -$114 |
|
1239
CALL
Wabtec
WAB
$51.1B
| $2.32M | 0.01% |
315
-34
| -10% | -$2.45K |
|
1240
PUT
ICU Medical
ICUI
$3.93B
| $2.32M | 0.01% |
+97
| New | +$23.3K |
|
|
CTRA
1241
DELISTED
Coterra Energy
CTRA
| $2.32M | 0.01% |
88,919
+6,892
| +8% | +$173K |
|
1242
iShares Semiconductor ETF
SOXX
$44.2B
| $2.32M | 0.01% |
+36,702
| New | +$2.17M |
|
|
NLSN
1243
PUT
DELISTED
Nielsen Holdings plc
NLSN
| $2.32M | 0.01% |
979
-447
| -31% | -$11.6K |
|
|
JNPR
1244
CALL
DELISTED
Juniper Networks
JNPR
| $2.32M | 0.01% |
875
-543
| -38% | -$14.6K |
|
|
BKI
1245
PUT
DELISTED
Black Knight, Inc. Common Stock
BKI
| $2.32M | 0.01% |
+425
| New | +$21.4K |
|
1246
CALL
Apollo Global Management
APO
$70.7B
| $2.31M | 0.01% |
819
-300
| -27% | -$8.53K |
|
1247
PUT
Devon Energy
DVN
$51.9B
| $2.31M | 0.01% |
733
-286
| -28% | -$7.99K |
|
|
MOMO
1248
CALL
Hello Group
MOMO
$869M
| $2.31M | 0.01% |
605
-10
| -2% | -$320 |
|
1249
Bath & Body Works
BBWI
$4.01B
| $2.31M | 0.01% |
+103,590
| New | +$2.28M |
|
1250
CALL
Post Holdings
POST
$4.12B
| $2.31M | 0.01% |
322
-51
| -14% | -$3.34K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.